US4680143A - Detergent compositions - Google Patents

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US4680143A
US4680143A US06748150 US74815085A US4680143A US 4680143 A US4680143 A US 4680143A US 06748150 US06748150 US 06748150 US 74815085 A US74815085 A US 74815085A US 4680143 A US4680143 A US 4680143A
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detergent
composition
alkyl
sulphonate
dialkyl
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US06748150
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David J. Edge
Appaya R. Naik
Melvin Scott
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Lever Brothers Co
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Lever Brothers Co
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    • CCHEMISTRY; METALLURGY
    • C11ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/0005Other compounding ingredients characterised by their effect
    • C11D3/0094High foaming compositions
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02Anionic compounds
    • C11D1/12Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/123Sulfonic acids or sulfuric acid esters; Salts thereof derived from carboxylic acids, e.g. sulfosuccinates
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02Anionic compounds
    • C11D1/12Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/22Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02Anionic compounds
    • C11D1/37Mixtures of compounds all of which are anionic
    • CCHEMISTRY; METALLURGY
    • C11ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11DDETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02Anionic compounds
    • C11D1/12Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/29Sulfates of polyoxyalkylene ethers

Abstract

A high foaming aqueous liquid detergent composition suitable inter alia for manual dishwashing is based on a ternary active detergent system of (a) dialkyl sulphosuccinate, (b) alkylbenzene sulphonate and/or secondary alkane sulphonate and (c) alkyl ether sulphate. This combination gives both performance and formulation (viscosity, hydrotropy) benefits.

Description

This is a continuation application of Ser. No. 551,457, filed Nov. 14, 1983, now abandoned.

The present invention relates to high-foaming liquid detergent compositions suitable for use in fabric washing, shampoos, and above all, in manual dishwashing operations in both hard and soft water.

The term "dishes" as used herein means any utensils involved in food preparation or consumption which may be required to be washed to free them from food particles and other food residues, greases, proteins, starches, gums, dyes, oils and burnt organic residues.

Light-duty liquid detergent compositions such as are suitable for use in washing dishes are well-known. Many of the formulations in commercial use at the present time are based on a sulphonate-type anionic detergent, especially on alkyl benzene sulphonate, in conjunction with an alkyl polyethoxy sulphate (alkyl ether sulphate). The sulphonate-type detergent generally predominates.

The sulphonate-type detergents most commonly used in dishwashing liquids are alkylbenzene sulphonates and secondary alkane sulphonates. Materials based on linear or near-linear alkyl groups, ie linear alkylbenzene sulphonates and secondary alkane sulphonates, are used in most developed countries for maximum biodegradability.

The linear alkylbenzene sulphonates most useful for dishwashing are those with an alkyl chain length ranging from C10 to C12. In practice a cut consisting predominantly of C10, C11 and C12 material but also containing small amounts of C9 and C13 material (and trace amounts of less than C9 and greater than C13 material) is generally used.

More recently, another class of sulphonate-type detergents, the dialkyl sulphosuccinates, has become of interest for use in high-foaming liquid detergent compositions.

GB No. 1 429 637 (Unilever) discloses hand dishwashing compositions containing as detergent-active material a water-soluble salt of a di(C7 -C9) alkyl ester of sulphosuccinic acid, in combination with an alkyl sulphate or an alkyl ether sulphate. If desired, other unspecified detergents may also be present.

GB No. 2 108 520, GB No. 2 104 913, GB No. 2 105 325, EP No. 71413 and EP No. 71414 (Unilever) disclose certain dialkyl sulphosuccinates, particularly those having C6 and C8 chains, and their use in detergent compositions alone and in combination with other detergent-active materials.

U.S. Pat. No. 3,910,855 (Abeles), GB No. 1 343 551 (Kao Soap), GB No. 1 604 054 (Elf Aquitaine) and Hungarian Pat. No. 174,837 (Szentirmay) disclose surfactant mixtures for various purposes that contain inter alia dialkyl sulphosuccinates and alkylbenzene sulphonates.

The present invention is based on the observation that in light-duty liquid detergent compositions, the use of a particular ternary combination of detergent-active materials--a dialkyl sulphosuccinate, an alkyl benzene sulphonate and/or secondary alkane sulphonate, and an alkyl ether sulphate--gives advantages both in terms of performance and, above all, in terms of formulation benefits.

The present invention accordingly provides a foaming liquid detergent composition in the form of a stable aqueous solution containing from 5 to 60% by weight of an active detergent mixture comprising

(a) a water-soluble salt of a dialkyl ester of sulphosuccinic acid in which the alkyl groups may be the same or different, in an amount of at least 2% by weight based on the total composition,

(b) a C9 -C15 alkylbenzene sulphonate and/or a C10 -C18 secondary alkane sulphonate, and

(c) a C10 -C18 alkyl ether sulphate.

The total active detergent level is preferably from 10 to 40% by weight, more preferably from 16 to 40% by weight.

The weight ratio of (a) plus (b) to (c) is preferably within the range of from 8:1 to 0.5 to 1, more preferably from 6:1 to 1:1, and advantageously from 3.5:1 to 1.5:1.

The weight ratio of (a) to (b) is preferably within the range of 4:1 to 0.1:1, more preferably from 2.5:1 to 1:1.

The compositions of the invention exhibit substantially better foaming performance than corresponding compositions in which the dialkyl sulphosuccinate is replaced by the same weight of sulphonate-type detergent (alkyl benzene sulphonate or secondary alkane sulphonate). The compositions of the invention also, however, have advantages over corresponding compositions in which the sulphonate-type detergent is replaced by the same weight of dialkyl sulphosuccinate, despite the better performance of the latter compositions, in that viscosity is much higher. Viscosities of 150 cp or more are very much easier to achieve using the ternary active system of the invention then when using a system in which dialkyl sulphosuccinate is the only sulphonate-type detergent present.

The clarity and stability of the compositions of the invention are also greatly improved owing to the presence of component (b), and the hydrotrope requirement lowered. Difficulties have been encountered in preparing clear, stable liquid detergent compositions based on dialkyl sulphosuccinates and alkyl ether sulphates. At relatively high ratios of sulphosuccinate to ether sulphate (3:1 and above) relatively large quantities of hydrotrope are required in order to obtain stable solutions having acceptable clear and cloud points, and in some cases acceptable formulations cannot be obtained even using large quantities of hydrotrope. Hydrotropes are materials present in a formulation to control solubility, viscosity, clarity and stability, but which themselves make no active contribution to the performance of the product. Examples of hydrotropes include lower aliphatic alcohols, especially ethanol; urea; lower alkylbenzene sulphonates such as sodium toluene and xylene sulphonates; and combinations of these. Hydrotropes are expensive and take up room in a formulation without contributing to its performance, and it is therefore desirable to use as small quantities of them as possible.

Accordingly, the compositions of the invention contain in the active detergent system three distinct components (a), (b) and (c) which must all be present.

The composition of the invention may if desired contain other detergent-active materials within its active detergent mixture, provided that at least 2% by weight of the whole composition is constituted by dialkyl sulphosuccinate(s). Preferably at least 1% by weight, more preferably at least 4% by weight, of the composition is constituted by component (b), and at least a further 1%, more preferably at least 4% by component (c).

The dialkyl sulphosuccinate component (a) may if desired be constituted by a mixture of materials of different chain lengths, of which the individual dialkyl sulphosuccinates themselves may be either symmetrical (both alkyl groups the same) or unsymmetrical (with two different alkyl groups).

The detergent-active dialkyl sulphosuccinates are compounds of the formula I: ##STR1## where each of R1 and R2, which may be the same or different, represents a straight-chain or branched-chain alkyl group having from 3 to 12 carbon atoms, preferably from 4 to 10 carbon atoms and more preferably from 6 to 8 carbon atoms, and X1 represents a solubilising cation, that is to say, any cation yielding a salt of the formula I sufficiently soluble to be detergent-active. The solubilising cation X1 will generally be monovalent, for example, alkali metal, especially sodium; ammonium; or substituted ammonium, for example, ethanolamine. Certain divalent cations, notably magnesium, are however also suitable.

The alkyl groups R1 and R2 are preferably straight-chain or (in mixtures) predominantly straight-chain.

Among dialkyl sulphosuccinates that may advantageously be used in the composition of the invention are the C6 /C8 unsymmetrical materials described and claimed in European Patent Application No. 82 303869 (Unilever) (Case C.1305); the dioctyl sulphosuccinate/dihexyl sulphosuccinate mixtures described and claimed in European Patent Application No. 82 303868 (Unilever) (Case C.1304/1); and the mixtures of symmetrical and unsymmetrical dialkyl sulphosuccinates described and claimed in European Patent Application No. 82 303867 (Unilever) (Case C.1304).

Component (b) is a C9 -C15, preferably C9 -C13, alkylbenzene sulphonate which is preferably linear. It may be used in the form of the salt of any suitable solubilising cation. Examples of suitable materials include Dob (Trade Mark) 102 ex Shell, Marlon (Trade Mark) A ex Chemische Werke Huls, and Sirene (Trade Mark) X12L ex Societa Italiana Resine, and Ucane (Trade Mark) 11 ex Union Carbide.

Alternatively or additionally component (b) may comprises a C10 -C18 secondary alkane sulphonate, for example, SAS 60 ex Hoechst.

Component (c) comprises an alkyl ether sulphate, preferably a material of the general formula II

R.sub.3 --O--(CH.sub.2 CH.sub.2 O).sub.n --SO.sub.3 X.sub.2 (II)

wherein R is a linear or branched C10 -C18 alkyl group, X2 is a solubilising cation, and n, the average degree of ethoxylation, is from 1 to 12, and more especially 1 to 8. In any particular commercially available alkyl ether sulphate a range of different chain lengths and differently ethoxylated materials will be present; the degree of ethoxylation n represents an average figure, and, for example, a material for which n is 3 will include individual materials ranging from n=0 (alkyl sulphate) to perhaps n=10.

Advantageously, an ether sulphate having an n-value of 2 or 3 is used. Mixtures of an ether sulphate and a corresponding alkyl sulphate, giving a lower overall n value, may also be used in the compositions of the present invention.

According to a preferred embodiment of the invention, a primary alkyl ether sulphate is used which contains 20% or less by weight of C14 and above material, preferably less than 10% by weight and more preferably substantially none. The content of C11 and shorter-chain material is advantageously also as low as possible, and most advantageously a sulphate consisting predominantly of C12 and C13 material is used. Exemplary of such a product is the Dobanol (Trade Mark) 23 series ex Shell. This consists of 50% C12 material and 50% C13 material, and is substantially free of other chain lengths; overall, the C12 and C13 material is 75% straight-chain and 25% 2-methyl branched.

If desired, component (c), the alkyl ether sulphate, may be supplemented by an ethoxylated nonionic detergent having an alkyl chain length of from C8 to C15 and a degree of ethoxylation of from 5 to 14. Suitable nonionic detergents include short-chain high-foaming ethoxylated alcohols of the general formula III:

R.sub.4 --O--(CH.sub.2 CH.sub.2 O).sub.m --H               (III)

wherein R4 is an alkyl group, preferably straight-chain, having from 8 to 12 carbon atoms, and the average degree of ethoxylation m is from 5 to 12. An especially preferred nonionic detergent is Dobanol (Trade Mark) 91-8 ex Shell, in which R4 is C9 -C11 (predominantly straight-chain) and m is 8. The ratio of alkyl ether sulphate to nonionic detergent is preferably least 1:1, more preferably 3:1 to 1.5:1.

The compositions of the invention will generally also contain minor amounts of one or more hydrotropes.

As indicated previously, suitable hydrotropes include lower aliphatic alcohols, especially ethanol; urea; lower alkylbenzene sulphonates such as sodium toluene and xylene sulphonates; and combinations of these.

As well as active detergent, water and (if necessary) hydrotrope, the compositions may contain the usual minor ingredients such as perfume, colour, preservatives and germicides.

The liquid detergent compositions of the invention, containing 5 to 60% by weight of active detergent in stable aqueous solution, may be used for all normal detergent purposes where foaming is advantageous, for example, fabric washing products, general purpose domestic and industrial cleaning compositions, carpet shampoos, car wash products, personal washing products, shampoos, foam bath products, and, above all, manual dishwashing.

The invention is further illustrated by the following non-limiting Examples, in which the dialkyl sulphosuccinate used was a statistical mixture (mole ratio 1:2:1) of di-n-octyl sulphosuccinate, n-hexyl n-octyl sulphosuccinate and di-n-hexyl sulpho-succinate (sodium salts), prepared from a 1:1 mixture of n-hexanol and n-octanol by the method described in Example 1 of GB No. 2 108 520 (Unilever).

EXAMPLE 1

Liquid detergent compositions were prepared as shown in the following Table. Composition 1 is in accordance with the invention, and Compositions A, B, C and D are comparative.

The alkylbenzene sulphonate used was Dob (Trade Mark) 102 ex Shell, sodium salt, and the alkyl ether sulphate used was Dobanol (Trade Mark) 23-3A ex Shell (n=3, ammonium salt).

The foaming performances of the various formulations were compared using a plate washing test. In the test, plates soiled with a standard starch/fat/fatty acid mixture were washed in a standard manner with 5 liters of test solution (total concentration of the product 1 g/liter in 5° H. or 24° H. (French hardness) water at 45° C.) in a bowl, until only a third of the surface of the solution in the bowl was covered with foam. The number of plates washed before this arbitrary end-point was reached was taken as an indicator of dishwashing and foaming performance.

______________________________________Example   1      A        B    C       D______________________________________Dialkyl   12     20       20   --      --sulphosuccinateAlkylbenzene      8     --       --   20      20sulphonateAlkyl ether      8      8        8    8       8sulphateUrea      10     10       15   10      10Ethanol   --     --       --   --       5Viscosity (cp)     327    unstable 140  1200    264Cloud point     -5     at       -1   <-10    <-10(°C.)     room            temp.Plates test24° H     27     32       32   24      245° H     34     39       39   27      27______________________________________

It will be seen that Composition 1 exhibited a good performance, as demonstrated by the plates test, and an acceptably high viscosity. For stability about 10% of urea hydrotrope was required. In Composition A the alkylbenzene sulphonate had been replaced by dialkyl sulphosuccinate and although the performance was even better than that of Composition 1 it was impossible to obtain a stable composition at the same urea level; raising the urea level to 15% (Composition B) gave a single-phase formulation but the viscosity was lower than that of Composition 1, and the cloud point higher.

In Composition C the dialkyl sulphosuccinate was omitted in favour of alkylbenzene sulphonate and the drop in performance will be noted. The viscosity was also so high that handling would be very difficult. To reduce this to a workable level the addition of ethanol (Composition D) was necessary.

EXAMPLE 2

The procedure of Example 1 was repeated at a higher total active detergent level (40% by weight). In this experiment the foaming performances were compared by means of a modified Schlachter-Dierkes test based on the principle described in Fette und Seifen 1951, 53, 207. A 100 ml aqueous solution of each material tested, having a concentration of 0.05% active detergent in 5° H. or 24° H. water at 45° C., was rapidly oscillated using a vertically oscillating perforated disc within a graduated cylinder. After the initial generation of foam, increments (0.2 g) of soil (9.5 parts commercial cooking fat, 0.25 parts oleic acid, 0.25 parts stearic acid and 10 parts wheat starch in 120 parts water) were added at 15-second intervals (10 seconds' mild agitation and 5 seconds' rest) until the foam collapsed. The result was recorded as the number of soil increments (NSI score). Each result was the average of 4 runs.

As will be seen from the Table, Composition 2 gave an NSI score in 24° H. water of 48, which was very close to that given by a commercially available premium quality dishwashing liquid (49). Comparative Composition E, in which the alkylbenzene sulphonate had been replaced by dialkyl sulphosuccinate, gave a better score but its viscosity was low. The corresponding alkylbenzene sulphonate formulation, Composition F, was so viscous as to be classified as a gel, and its foaming performance was poor.

______________________________________          2        E     F______________________________________Dialkyl sulphosuccinate            18         27    --Alkylbenzene sulphonate             9         --    27Alkyl ether sulphate            13         13    13Urea             12         12    12Ethanol           4          4     4Viscosity (cp)   172        85    gelCloud point       2          1NSI Score24° H     48         59    335° H      53         64    38______________________________________
EXAMPLES 3 AND 4

A composition according to the invention containing secondary alkane sulphonate instead of alkylbenzene sulphonate was prepared. The alkane sulphonate was SAS 60 ex Hoechst. This composition was compared with Composition 1 of Example 1 and with a similar composition (Composition 4) containing more urea.

______________________________________          3      1      4______________________________________Dialkyl sulphosuccinate            12       12     12Alkylbenzene sulphonate            --        8      8Alkane sulphonate             8       --     --Alkyl ether sulphate             8        8      8Urea              8       10     12Viscosity (cp)   260      327    298Cloud point      -8       -5     <-10NSI Score24° H     25       27     27            33       34     34______________________________________

It will be seen that Composition 3 displayed excellent viscosity, cloud point and plate-washing performance, although the latter was slightly lower than that of the corresponding alkylbenzene sulphonate system. The cloud point was better than that of Composition 1, but addition of more urea (Composition 4) improved the cloud point of the alkylbenzene sulphonate system without undue viscosity reduction.

EXAMPLES 5-9

The following compositions according to the invention containing total active detergent levels ranging from 29 to 34% were prepared. All were clear stable homogeneous liquids having cloud points of -8° C. or below and viscosities above 200 cp.

______________________________________        5        6      7     8    9______________________________________Active detergent        33       33     32    31   29Sulphosuccinate        16       2.5    15    2.5  2.5Dob 102      8.5      21      8    17.5 15.5Dobanol 23-3A        9.5      11      9    11   11Urea         15       8      14    6    5.5______________________________________
EXAMPLES 10-15

The following compositions according to the invention containing total active detergent levels ranging from 23 to 28% were prepared. All were clear stable homogeneous liquids having low cloud points.

______________________________________         10    11      12  13    14  15______________________________________Active detergent         28    27      27  26    25  23Sulphosuccinate         13    13      11  12    13  10Dob 102        7     6       8   6     4   6Dobanol 23-3A  8     8       8   8     8   7Urea          12    12      12  12    12  10______________________________________
EXAMPLES 16-19

The following compositions according to the invention containing total active detergent levels ranging from 16 to 20% by weight were prepared. All were stable homogeneous liquids having low cloud points. Composition 16 contained a different alkylbenzene sulphonate, Ucane (Trade Mark) 11 ex Union Carbide, and Compositions 17 and 19 contained a different ether sulphate, Lutensit (Trade Mark) 2270 ex BASF.

______________________________________           16    17        18  19______________________________________Active detergent           20    19        18  16Sulphosuccinate 10    10        10   8Dob 102         --    --         4  --Marlon A        --    4         --   4Ucane 11         4    --        --  --Dobanol 23-3A    6    --         4  --Lutensit 2270   --     5        --   4Urea            10    10        10  10______________________________________

Claims (9)

We claim:
1. A foaming liquid detergent composition in the form of a stable aqueous solution containing from 16 to 40% by weight of an active detergent mixture comprising
(a) a water-soluble salt of a dialkyl ester of sulphosuccinic acid in which the alkyl groups may be the same or different, in an amount of at least 2% by weight based on the total composition,
(b) a C9 -C15 alkylbenzene sulphonate, and
(c) a C10 -C18 alkyl ether sulphate, wherein the weight ratio of (a) to (b) is from 4:1 to 0.1:1 and the weight ratio of (a)+(b) to (c) is from 2.5:1 to 1:1.
2. The detergent composition of claim 1, wherein the weight ratio of (a) to (b) is within the range of from 4:1 to 1:1.
3. The detergent composition of claim 1, wherein component (b) constitutes at least 4% by weight of the total composition.
4. The detergent composition of claim 1, wherein component (c) constitutes at least 4% by weight of the total composition.
5. The detergent composition of claim 1, wherein the alkyl groups of the dialkyl sulphosuccinate (a) each have from 4 to 10 carbon atoms.
6. The detergent composition of claim 5, wherein the alkyl groups of the dialkyl sulphosuccinate (a) each have from 6 to 8 carbon atoms.
7. The detergent composition of claim 1, wherein component (c) comprises an alkyl ether sulphate containing 20% or less of C14 and higher chain length material.
8. The detergent composition of claim 7, wherein component (c) comprises an alkyl ether sulphate substantially free of C14 and higher chain length material.
9. A foaming liquid detergent composition in the form of a stable aqueous solution containing from 16 to 40% by weight of an active detergent mixture comprising
(a) a water-soluble salt of a dialkyl ester of sulphosuccinic acid in which the alkyl groups may be the same or different, in an amount of at least 2% by weight based on the total composition,
(b) a C9 -C15 alkylbenzene sulphonate, and
(c) a C10 -C18 alkyl ether sulphate,
wherein the weight ratio of (a) to (b) is from 4:1 to 1:1 and the weight ratio of (a)+(b) to (c) is from 2.5:1 to 1:1, said detergent composition having a viscosity of from about 150 cp to about 327 cp at 25° C.
US06748150 1982-11-16 1985-06-25 Detergent compositions Expired - Fee Related US4680143A (en)

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Publication number Publication date Type
JPS59102997A (en) 1984-06-14 application
EP0112047B1 (en) 1986-09-24 grant
CA1220110A1 (en) grant
JP1352850C (en) grant
DK523483A (en) 1984-05-17 application
DK523483D0 (en) 1983-11-15 grant
JPS6119677B2 (en) 1986-05-19 grant
GB8330366D0 (en) 1983-12-21 grant
EP0112047A1 (en) 1984-06-27 application
GB2130235B (en) 1986-05-08 grant
GB2130235A (en) 1984-05-31 application
DE3366480D1 (en) 1986-10-30 grant
CA1220110A (en) 1987-04-07 grant

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